I have ported the `BytecodeProvider` and made all tests run green. The only exception are six tests that run some Arquillian archive which seems to miss a dependency to Byte Buddy causing a NoClassDefFoundError. I did some digging but could not find the cause. I would appreciate some help here, my branch is local at: https://github.com/raphw/hibernate-orm/

I am also having some style check issues. IDEA does not seem to properly pick up the checkstyle.xml when importing it as a code style. I will need to have another look at that. Any help is appreciated here, too, if someone has the same issues. I have imported checkstyle rules before, no idea what the problem is so far.

So far it is a direct port, but as I said, I think this is best for an initial implementation as this allows for an easy finding of failures.

Next, I would start porting the `Enhancer` and try to generalize the API to be included in the `BytecodeProvider` as suggested by Steve Ebersole.